Shikamaru. He's even sharper than Sakura, quite good with this whole countering genjutsu thing, and quite fun to have just lie around. And he's just a guy I like, and would like to hang out with.
Anko gets my Second vote. She's got nothing else to do, and I highly doubt ANBU wants her on the frontlines. Also, dark and sarcastic ftw.
-V